Electrical Basics Objective Questions

1. An instantaneous change in voltage is not possible in:
a) A Resistor
b) An Inductor
c) A Capacitor
d) A Current

C

2. In a R-L Series circuit the power factor is:
a) Leading
b) Lagging
c) Zero
d) Unity

B

3. In a purely inductive circuit ___ power is zero
a) Apparant
b) Reactive
c) True
d) Inductive

C

4. A phasor in a line which represents the:
a) RMS value and phase of alternating quantity
b) Average value and phase of an alternating quantity
c) Magnitude and direction of an alternating quantity
d) None of the above

A

5. Which of the following statements associated with purely resistive circuit is correct:
a) Power factor is unity
b) Power consumed is zero
c) Power factor is zero
d) Heat produced is zero

A

6. The ratio of the effective value to the peak value is called the __ factor:
a) Form
b) Peak
c) Average
d) Q-factor

A

7. An ac generator running at 1000 rpm produces emf of 50hz. The number of poles on the generator is:
a) 2
b) 4
c) 6
d) 8

C

8. Which of the statement pertained to resistance is correct:
a) They oppose the change in the current
b) They can act as energy storage devices
c) They can dissipate desirable amount of power
d) None of the above

C

 9. An insulation is subjected to __ value of applied alternating voltage to it:
a) Average
b) Peak
c) RMS
d) Double of the peak

B

10. The form factor for dc supply voltage is always:
a) Zero
b) Unity
c) Infinity
d) Any value between 0 and 1 

B